Typical Scenarios of Wave Regimes off Rio Grande do Sul, Southern Brazil

Romeu, Marco Antônio Rigola; Fontoura, Jose Antonio Scotti; Melo, Eloi

doi:10.2112/jcoastres-d-12-00085.1

Cited by 17 publications

(4 citation statements)

References 7 publications

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“…The wave climate in south/southeastern Brazil is influenced by S/SW swells generated by remote storms and by wind seas that vary from NE associated with the dynamics of the South Atlantic Anticyclone and from S/SE to S/SW under the influence of extratropical cyclones (e.g., Pereira et al., 2017). The analysis of wave model hindcasts in the area has pointed out that the most energetic waves are generated by strong winds associated with the passage of extratropical cyclones (e.g., Romeu et al., 2015). Atmospheric events of this type occur in the region with a frequency of about 3–5 events per month (e.g., Hoskins & Hodges, 2005; Stech & Lorenzzetti, 1992), being more often during fall and winter (Reboita et al., 2018).…”

Section: Study Regionmentioning

confidence: 99%

The Effect of Currents on Large Surface Gravity Waves Under Cyclonic Conditions in the South/Southeastern Brazil

2023

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Although ocean surface currents are not accounted for in most wave modeling studies, recent works have demonstrated that ocean circulation features may have a great impact on surface gravity waves. In this case study, we coupled in a one‐way mode the hydrodynamic model Regional Ocean Modeling System (ROMS) and the wave model Simulating WAves Nearshore (SWAN) to study the effect of currents on large wave events (LWEs) produced under the influence of cyclones in south/southeastern Brazil. For the five LWEs studied, chosen due to the distinct importance that current‐to‐wave effects had for the period, the results indicate that the addition of currents on the wave model improved the accuracy of the peaks of significant wave height, generally increasing them (by as much as 27%). The increase in wave height occurred mainly near the shelf edge and slope, where the southwestward‐flowing Brazil Current opposes the dominant direction of cyclone‐generated waves (usually from S/SE to S/SW). Modulation of wave height by currents in the subinertial band explained up to 95% of the total variance of the difference between results with and without ocean currents, and this band was largely related to the Brazil Current. Its near‐inertial counterpart explained up to 22% of the total variance and was primarily due to near‐inertial currents in the region. This study provides, for the first time, conclusive evidence that wave‐current interaction can impact LWEs in south/southeastern Brazil.

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Section: Study Regionmentioning

confidence: 99%

The Effect of Currents on Large Surface Gravity Waves Under Cyclonic Conditions in the South/Southeastern Brazil

2023

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“…The sea waves, which result from the action of local winds, come from the NE and E, which makes this also the dominant direction of waves in the region. This type of wave has a period of between 6 and 8 seconds, and a significant height of between 0.5 and 1.5 m (Tomazelli and Vilwock, 1992;Almeida et al, 1999;Toldo et al 2006;Romeu et al, 2015;Rodriguez et al, 2016;Casagrande et al, 2018). The storm waves, although less frequent, correspond to higher energy waves.…”

Section: Study Areamentioning

confidence: 99%

Regional Coastline Changes and Future Predicted Scenario on Southern Brazil

et al. 2021

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The Rio Grande do Sul (RS) coastline consists of a 615 km long sandy barrier, with a NE-SW orientation. The genesis of this geographical area is related to Quaternary sea-level changes, with a complex Lagoon-barrier system. This study presents a compilation of decades of studies about short-term monitoring and long-term projections conducted by the two local main research centers on the subject. Trends in shoreline behavior between 2002 to 2013 were analyzed. The specific causes of these variations are not yet fully understood. However, some factors are likely to be responsible for coastline behavior in the long and short term. The main erosive hotspots found along the RS coastline are influenced by wave energy due to the refraction caused by the bathymetric features and coastline orientation. The Cassino Beach sector, however, has a pronounced progradation which in the long term can be mainly related to its orientation, and more recently due to jetties built at the Patos Lagoon inlet, which provided more sediment retention of the prevailing net longshore drift to the northeast. This research also offers a review about shoreline changes along the four existing inlets. Coastal vulnerability to sea-level rise (SLR) analyzed through coastline recession rates in long-term scenarios (2030 and 2100) indicated that the most vulnerable sectors are those located along embayments, which coincide with low gradient shorefaces.

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“…Geomorfol. (Online), São Paulo, v.21, n.3, (Jul-Set) p.529-548, 2020 sul do Brasil são de 100° (E) e 160° (SE), com alturas de onda variando entre 1 -1,50 m e período entre 6 a 14 s, com média de 8 s para vagas (sea) e 12 s para ondulação (swell) (CUCHIARA et al, 2009;STRAUCH et al, 2009;ROMEU et al, 2015;CECÍLIO e DILLENBURG, 2019). As alturas e os períodos das ondas exibem um aumento progressivo com a propagação das ondas de leste para sul, sendo as ondas do quadrante S -SE as mais altas (CALLIARI e TOLDO, 2016).…”

Section: Aspectos Oceanográfi Cos E Climáticosunclassified